Ultimo is a premium Magento theme with advanced admin module. It's extremely customizable and fully responsive. Can be used for every type of store.
The best Magento theme documentation on ThemeForest. It also describes selected Magento features which you need to know when starting to work with Magento.
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Use Ultimo as a starting point for your custom projects. Unlike many other themes, Ultimo lets you create multiple custom sub-themes (theme variants) for your clients.